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48results about How to "Improve incident efficiency" patented technology

Light guide plate, surface illuminating device, and liquid crystal display device

Disclosed is a light guide plate wherein the utilization efficiency of light is high, light with less luminance variation can be output, and a distribution such that the central part of the screen is brighter than the peripheral part can be achieved. The light guide plate comprises a rectangular light output surface, a light input surface through which light traveling in a direction approximately parallel to the light output surface is allowed to enter, a back surface on opposite side to the light output surface, and scattering particles dispersed inside. The light guide plate is so configured that the light guide plate has two or more layers which are stacked in a direction approximately perpendicular to the light output surface and which have particle densities of the scattering particles different from one another, the layers include a first layer which is on the light output surface side and the particle density of which is Npo and a second layer which is nearer to the back surface than the first layer and the particle density of which is Npr, the relation Npo<Npr is satisfied, the shape of the cross section taken in a direction perpendicular to the light input surface on the light output surface side is concave, the thicknesses of the first and second layers in a direction approximately perpendicular to the light output surfaces are varied from each other, and thereby the combined particle density of the light guide plate in a direction perpendicular to the light input surface is varied.
Owner:FUJIFILM CORP

LED (Light-Emitting Diode) plane light source and method for increasing light guiding efficiency thereof

The invention relates to an LED (Light-Emitting Diode) plane light source and a method for increasing the light guiding efficiency thereof, belonging to the technical field of light sensing engineering application. The LED plane light source is characterized in that a light reflection layer is arranged between the side of a light guiding plate and a PCB (Printed Circuit Board), a light outlet is prearranged at a position on the light reflection layer corresponding to LED light sources, and the PCB, the light reflection layer and the light guiding plate clings to each other in sequence; and the LED light sources respectively arranged at two opposite sides of the light guiding plate are arranged in ways of mutual cross and ectopic complementation. One side of each of the LED light sources is additionally provided with the light reflection layer on which the light outlet is prearranged, thus the light reflection at the side of the light guiding plate is avoided, light emitted by an LED is directly led out through the light outlet by the light guiding plate, and the light incidence efficiency is increased; the LED light sources are arranged in ways of mutual cross and ectopic complementation, thus, the condition that the LED absorbs the light from the opposite LED per se is avoided, and the light guiding efficiency is increased; and on the basis of ensuring same brightness, the consumption of the LEDs can be reduced and the lost can be lowered.
Owner:PUHUAN OPTOELECTRONICS TECH SHANGHAI
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